Tests: Fix make check with numpy 1.10
Tests: Fix make check with numpy 1.10

This is another fix in the vein of e40ea49.  Without this change the
`test_template_annotation_with_ndarray_template` test would hang
indefinitely with numpy 1.10.  This is due to a change to the default
casting rule.  The [release notes] say:

> **Default casting rule change**
>
> Default casting for inplace operations has changed to `'same_kind'`.

[release notes]: https://github.com/numpy/numpy/blob/master/doc/release/1.10.0-notes.rst#default-casting-rule-change

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